Rotary motor.



' AVAILABLE COPY w. S. ELLIOTT.

RQTARY MOTOR.

APPLICATION FILED JAN.20, 190a.

Patented Nov. 26, 1912.

SHEE S HE W. s'. EIBIOTT.

ROTARY MOTOR.

APPLICATION FILED-JAN. 20, 190B.

2 SHEETS-SHEET 2.

'0 INVENTOR K & M MFQ Q Patented Nov. 26, 1912.

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WILLIAM s. ELLIOTT, or PITTSBURGH, PENNSYLVANIA;

ROTARY MOTOR.

Specificatiohot Letters Patent.

Patented Nov. 26, 1912.

Application filed January 20, 1908; Serial No 411,588.

To an whom it may concern:

Be it known that I, W ILLIAM SQELLIOTT,

forms of the eX'p-ansible piston-blades; Fig;

9 is an elevation of one form, of piston blade; Fig. 10 is a cross-section of a modified formof motor; and Fig. 11 is a longitudinal. section, showing another modifica tion.

My invention has relation to the class of' rotary motors, and is designed to provide a simple and compact motor which is e'sp'ecially adapted for use with air as a motive power, although other motive fluid may be used.

The more-particular objects of my in-- vention' are to provide means for relieving the motor from-the effectof an accumula tion of air or other motivefluid at the in: ner end of the" piston shaft; and to provide animproved construction of piston which will at all times maintain'a close contact between its outeredges and the inner walls of the cylinder,

The precise, nature of my invention will be best understood by reference to the a'ccompanying drawings, which will nowv be "described, and in which I have shown several different embodiments of my invention, it'being premised, however, that the invention is susceptible to various other changes and modifications.

-Referring first to the construction shown in Figs. 1 to .4, inclusive, the numeral 2 designates. the cylinder offthe motor, having therein an eccentricallylocated piston-' This cylinder 18 secured be-.

chamber 3. I tween the end-heads 4 and 5 by means of the long tension screws 6, or by any other an exhaust port 12 which exten suitable means which will permit the parts to be readily detached. The head 4; preferably constitutes the admission head of the motor, and is provided with an admission chamber 7, which is supplied with'air or other motive fluid, by means of apipe or nozzle 8 adapted for connection with a supply-pipe or hose. Leading from the admission chamber 7v through the head 4 is an ad.-

mission port 9, andthe thickened wall of the cylinder 2 is formed with a registering, longitudinally extending port 9 which corn.-

municates with the interior of the-cylinder by the plurality of cross-ports 1 0.

' ll'is alongitudinally extending exhaust port in the wall of the cylinder 2 with which .itcommunicates'by'- the cross ports'll and which communicates at its forward end with 1 ds outwardly through the head 5. i i y 13 designates the piston shaft, which is journaled in bushings. 14 and 15, seated within the heads 4 and 5, and which isextended through the head 5 and is formed with a threaded shank 13, or 'other suit-- able means for the attachment thereto of the tool or other device to be operated by the motor. diameter within the rear bushing 15, forming a thrust shoulder;16 within said bushingyand its inner end 'hasfa head or collar 17 which turns in a space or chamber 18 withinthe head 4.- This. space or chamber is formed with a vent, opening 19 which leads outwardly. from said chamber to the atmosphere. The purpose of this vent opening is .to relieve the piston shaft from the effect of any accumulation of air which might otherwise occur in the space or'chamber 18 by reason of leakage from the cylinder through the rear bushing. 15. Another advantage of this air-chamber and vent is that by lubricating the interiorof the cylinder in any suitable manner, the air which leaks through the hearing will carry with it The piston shaft is of reduced suficient lubricant to keep the bearing in v proper condition.

; Secured in the piston shaft is a diametrically extending piston blade 20 which is composed of two interfitting members 21 and 22. 'This blade is free to-slide bodily in the slot in the piston shaft, and the two members thereof are also, free to slide upon each other for the purpose of insuring close contactbetween their outer longitudinal edges and ,the interior wall of tlie cylinder, by the centrifugal action of rot atioh. For the purpose of increasing this. centrifugal action upon the members of the olades, their inner portions are cut away in the manner indicated at 23 in Figs. 3 and 5 and whereby their centers of mass are liirough't toward their outer ends where the centrifugal action thereof will have its greatest effect. While at the same time, the cutting away of the members reduces the centrifugal force of the members as a whole and thereby reduces their friction against the cylinder. This result may be obtained in several dif fereut ways. Thus in Figs. 3, 6 and 8, I

have shown the cutting away of the inner faces of the blademembers to (liilerent extents for-this purpose, while in Fig 7 I have shown one of the members as having a slot 24 therein to receive loosely therein the thin web-portion 25 of the other member, the inner walls of the slot being cut away as indicated at 26 for the purpose of reducing the mass toward the center of the blade and bringing the centers of mass nearer the outer edges of the blades. A spring 27 may be interposed bctw son the two members. of

the blades for the purpose of assisting the centrifugal action in forcing them outwardly into contact with the cylinder walls, but this Will not be necessary'ordinarily, e1:- cept with motors which are designed to run at a comparatively low speed, For motors of relatively l'iiglii speet centrifugal action alone, due to the concentrating of the centers of mass tow ard the outer edges of the blades, as above described, will be sulticient to all times maintain the proper cont: ct

of the blade-edg es In the form of motor above described, the interior of t he cylinder has a somewhat oval cross-section. The form of the cylind r in section may, however, be of any approved form, such as'the curveshown in Fig. 10. 1

In the moditi cation shown in Fig. 11, the end of the pist on shaft is 'uio'vided with a knocltcr attachment 28, which is provided with a piston chamber 29, fitted with a, piston 30, to which is attached a knocking tool The chamber 29 is supplied with air through a port which connnunicates with a pipe or tube extendinr longitudinally thrmigh the pistonslmft l3, and into the adini ion chamber tion of the cyliodor-head. ln ti "tion the cylinder itself is shown as end-extensions which form. the heads which the bushings or bearings 15 haust-ports l1 and 12. In the form of motor shown in Fig. ll, the attachment 28 is not only rotated by the rotation of the piston shaft, but the piston 30 is also reciprocated, thereby actuating the knocking tool 31, the piston 30 acting as its own valve to control the admission of air from the pipe 33 through the port 32 and its exhaust at the port i I do not herein wish to limit myself any iarticula r construction of the motor as a whole, since my invention is adapted to various forms of rotary motors of the genoral types shown and described. The advantages of my invention result from the provision of the chamber or space at the inner end of the piston shaft, with the vent therefor, for the purpose of pre venting accumulation or leakage of air or other motive fluid, in the manner above de scribed and from the construction of the piston blades whereby their centers of mass are brought toward their outer edges for the purpose of increasing the centrifugal ao tion of rotation of their outer portions, while reducing the centrifugal action and friction as a whole. thereby maintaining proper contact with the cylinder walls without undue wear. blade also automatically compensates for all wear wl'iich may take place. either on the edges of the blad er on the cylinder wall. It will be noted that in the form first described. the bushings M and 15 have enlarged inner ends or flanges which close the open ends of the cylinder and define the ends of the piston chamber. 'l hese bushings, which are removable, not only form rencwable Wearing surfaces for the Sllfllfll journals, but they also form Wearing surfaces for the ends of the piston blades. After wear has occurred, these ineml'iers may be readily i temoved and renewed, thus preventing the wear from causing leakage around the ends of the piston blades to an extent which will interfere with the operation of the motor. This can he done without the necessity for either a new cylinder or new end portions. lhe. same result is accomplished in the construction shown in It by the provision of the removable wear plates 14" and 1,4". which define the endsof the piston chamber. Tt will m armarent that so'long as these feafrom through the cross-ports 11, and ex- This construction of the strnction and arrangement of the niotor as a whole may be I of fi-iv dely varying cliar- 1. In a rotary motor, a pistonishaft, a rear bearing for said shaft, an airspace adjacent to said bearing, and means for venting said space; substantially as described.

2. A rotary motor having an air space at thc rear end of the'piston shaft, and means for venting said space; substantially as described.

3. In a motor, a piston shaft and an airchamber adjacent to one of the bearings of said shaft. and having avent opening leading therefrom; substantially as described.

a. In a motor, a cylinder having a longitudinally extending admission port, ported heads fitted to the ends of the cylinderand detachably secured thereto, said heads having bearings for the motorshaft, and the rear head having an admission chamiber therein, the rear head hating a vent opening therein. communicating with ---the rear shaft bearing; substantially as described.

A rotary motor having a chamber containing a motor element, a shaft on which said element is mounted, said shaft having frontand rear bearings,.the front end of the shaft extending beyond the front. bearing for attachment to a tool, and the rear bearing terminating and being inclosed.

within the rear end of the motor, means for admitting Working fluid to the cylinder through its-rear end, and means for relieving the accumulation of fluid at the rear ib end of the shaft; substantially as described.

6. A rotary motor having a fiiiid supply pipe'connected at its rear head, and hav ing a longitudinally extending port leading to .the cylinder, a motor shaft having its axis parallel to the axisof the supply pipe,

the rear hearing for said shaftbeing locatedin front of the supply-pipe connection, and there being an air space adjacent toithe end. of said shaft; substantially as described.

7 A rotary motor having a connection for a fluid supply at one end and a shaft .terminatingin front of the flu d supply connec-' tion, and there being an airspace adjacent to the end ofthe shaft; substantially as described,

,8. A rotary motor having a connection for.

'9. A rotary motor having a piston'shaft and a socket bearingc for therein end-of Csaid shaftgtogethergwith meansfor vent ingsaid bearing to prevent. an acciimula :tion .ofpressuretherein; substantially as 1:

described.

10. A rotary tending. reariv-ardly Within a bearing, and means for venting pressure which accumula'tes at the rear end of the shaft; substantially as described.

11. A rotary. motor having front and rear bearings, a motor chamber between the bearings, a supply connection at' the rear of the rear. bearings, a passageway leading from the supply connection to the motor chamber, and an opening to the "atmosphere at the rear end of the shaft; substantially as described.

12. A rotary motor having achamber containing a motor element and having end portions at the ends of said chamber, a shaft on which said element is mounted, one of said end portions having a through bearing, and the other of the end portions containing motor hai ing a shaft his) to Q a socket bearing for said shaft, and a Wear member seated in a counter-bore or recess of each end portion, said wear members havingopenings therethrough for the shaft, and being of a diameter equal at least to the diameter of the motor chamber, the ends of which chamber they define; substantially as described.

13. A rotary motor having a chamber containing a motor element and shaft on which said element is mounted,said shaft having front and rear bearings. the front end of the shaft extending through the front bearing for attachment to a'tocl and the rear bearing terminating and being inclosed within the rear end of the motor, means for admitting Working fluid to said chamber through the rear end of the motor, and Wear members taining a motor element and havingend portions at the ends of said chamber, a shaft on which said element is mounted, one of said end'portions having a throughbearing, and the other ofsaid portions containing a socketfbearing for said shaft. anda wear member seated inia counter-bore or recess of an end portion, said wear member defining an end of the motor chamber and having an opening therethrough for said shaft, the wear member being of adiaineter equal at least to the-diameter of the'motor chamber;

substantially as described.

15. A rotary motor comprising end members having elongated bush bearingsfor the rotary element-of the motor," and an 'intermediate cylinder member, the'bear'ing, in the through said bearing; substantially as derear end member terminating within said bearing having a vent opening leading to member, and means for preventing accuthe atmosphere; substantially as descrlbed. mulation of pressure at the rear end of the In testimony whereof, I have hereunto set 10 bearing due to leakage from the cylinder my hand. I

WILLIAM s. ELLIOTTJ... S ri d- Witnesses:

v 16. A rotary motor having a rear ported JOHN luILLER; closure containing a shaft bearing, said H. M. CORWIN'. Q 

